Using Ohm's law, if 120 V is applied across 300 ohms, what is the current?

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Study for the Con Edison Basic Electric Test. Prepare with flashcards and multiple choice questions, each question has hints and explanations. Get ready for your exam!

Multiple Choice

Using Ohm's law, if 120 V is applied across 300 ohms, what is the current?

Explanation:
Ohm's law links voltage, current, and resistance: current equals voltage divided by resistance. With 120 volts across 300 ohms, the current is 120 / 300 = 0.4 amperes, which is 400 milliamperes. This shows that for a fixed resistance, current scales with voltage. If you changed the voltage, the current would change proportionally (e.g., 12 V across 300 Ω would give about 40 mA, 600 V would give about 2 A).

Ohm's law links voltage, current, and resistance: current equals voltage divided by resistance. With 120 volts across 300 ohms, the current is 120 / 300 = 0.4 amperes, which is 400 milliamperes. This shows that for a fixed resistance, current scales with voltage. If you changed the voltage, the current would change proportionally (e.g., 12 V across 300 Ω would give about 40 mA, 600 V would give about 2 A).

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